Nitrogen combines with metals to form

Identify the reaction which does not liberate $N_2$.

What compounds are formed when phosphine $(PH_3)$ is absorbed in a solution of mercuric chloride $(HgCl_2)$?

When $AgNO_3$ is heated strongly,the products formed are

Thallium shows different oxidation states because

Given below are two statements :
Statement $-I :$ The pentavalent oxide of group $-15$ element,$E_2O_5$,is less acidic than trivalent oxide,$E_2O_3$,of the same element.
Statement $-II :$ The acidic character of trivalent oxide of group $15$ elements,$E_2O_3$,decreases down the group.
In light of the above statements,choose the most appropriate answer from the options given below.